I was listening to the KRNO feed on tuesday the 13th and was hearing intermittent air race traffic. Seemed to be mostly race control clearing people onto the course. Im not sure if this was still happening during the accident.

Turns out that the race was captured on the KRNO feed. I did a quick edit of the beginning of the race. This is the line up for the start of the race. The voice you hear is the pace pilot. About 10 minutes after this you can hear the first medical helicopter heading to stead air field.

CNN is reporting that the pilot issued a mayday call before the crash, which must have been on a different frequency.

In the videos you can hear the engine running just prior to impact. I don't know anything about P-51's and their fuel capacity, but I would have thought there would at least have been small patches of fuel born fire.